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20130211
20130219
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, nasa has been charged by congress with keeping a 24-hour-a-day seven-day-a-week watch on the skies, and they're doing this principally with three observatories in new mexico, california and puerto rico, that have discovered about 98% of all the asteroid we know that are out there. >> axelrod: if they identify a potential threat what can then be done by way of a defense system? well, that's a real possibility. you don't want to destroy these things. they're too dangerous and it's too impractical. what you can do is deflect them. nasa has already perfected the art of landing on asteroids orbiting asteroids and we even fired an impactor into the side of a comet to study the debris. you can do the same impact mod welan asteroid and speed it up or slow it down by as little as a few centimeters a second. that way had it arrives at earth's orbit we've already passed by or haven't arrived at the rendezvous yet. >> axelrod: just a fraction. >> just a fraction. >> axelrod: in south africa today the extended family of olympic runner oscar pistorius came to his defense claiming the state's own
Search Results 0 to 2 of about 3 (some duplicates have been removed)